“Staff closed off one side of Bergdorf’s so Hillary could come in privately to get her hair done. An elevator bank was shut down so she could ride up alone, and then she was styled in a private area of the salon," a source told Smith.

"Other customers didn’t get a glimpse. Hillary was later seen with a new feathered hairdo."

When Clinton goes to the chichi Bergdorf barbers, her go-to hair man is none other than salon owner John Barrett.

Seeing Barrett comes with a premium. Page Six says: He "charges regular mortals $600 for a cut and blow-dry. Hair color can cost an extra $600."

Clinton was fairly frank -- and funny -- when revealing at her big Roosevelt Island rally in June that she's be coloring her coif for years.

"You know, I know how hard this job is. I've seen it up close and personal. All our Presidents come into office looking so vigorous. And then we watch their hair grow grayer and grayer," she said to laughter.

"Well, I may not be the youngest candidate in this race. But I will be the youngest woman President in the history of the United States! And the first grandmother as well.

"And one additional advantage: You won't see my hair turn white in the White House. I've been coloring it for years!"

Other than Clinton, there's really only one other candidate for president of the United States whose hair gets as much media coverage.